Portable speaker



FIG. 1 is a perspective view of a portable speaker showing my new design;

FIG. 2 is top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a right side elevational view thereof; and,

FIG. 7 is a rear elevational view thereof.

The broken line showing on the drawing disclosure is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a portable speaker, as shown. 